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Accounts Receivable
 12 Months Ended
Dec. 31, 2012
Accounts Receivable  
Accounts Receivable

5. Accounts Receivable

        Accounts receivable consisted of the following at December 31:

(in thousands)
   2012   2011  

Contract receivables

   $ 112,316   $ 99,121  

Contract retainages

     56,053     28,299  

Other

     177     569  
           

 

     168,546     127,989  

Less: Allowance for doubtful accounts

     (1,305 )   (1,078 )
           

 

   $ 167,241   $ 126,911  
           

        The roll-forward activity of allowance for doubtful accounts was as follows for the years ended December 31:

(in thousands)
   2012   2011  

Balance at beginning of period

   $ (1,078 ) $ (947 )

Reduction in (provision for) allowances

     (383 )   (159 )

Write offs, net of recoveries

     156     28  
           

Balance at end of period

   $ (1,305 ) $ (1,078 )